Drivers are experiencing major delays on the A1 after a crash this morning at Great Gonerby.
Most routes in and out of Grantham are affected and the A1 is seeing queues for more than five miles.
Lane 1 was closed by police southbound at the slip-road.
Lincolnshire Police said a car overturned in the collision near to the Boothby Pagnall junction.
There were no injuries reported at the scene.